The table gives information about the heights, in cm, of some children. Height (in cm)
Frequency
140 7
150 17
160 20
170 6
Estimate the mean height, in cm, of the children.

For each proportion find the unknown number x 1/5/8=×/15

Nine more than four times a number is the same as one less than twice the number. find the number?

Consider a bag that contains 220 coins of which 6 are rare indian pennies. for the given pair of events a and b, complete parts (a) and (b) below. a: when one of the 220 coins is randomly selected, it is one of the 6 indian pennies. b: when another one of the 220 coins is randomly selected (with replacement), it is also one of the 6 indian pennies. a. determine whether events a and b are independent or dependent. b. find p(a and b), the probability that events a and b both occur.